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[dev feb 24] I think I had an Ant script running twice in parallel and tried to click on one version in the Execution Window to stop it; then this NPE was thrown. Looks like a clear bug in ListView - NodeOp.findActions is guaranteed to be able to return null, yet Utilities.actionsToPopup cannot accept null as an arg.
Created attachment 9145 [details] Stack trace
I filed a patch 31476 which will garantee that NodeOp.findAction() won't return null. The patch was applied Feb26, I close it now as worksforme.
Without new informations for long time - verifying.